A kind of nano-chelating agent and preparation method thereof
A chelating agent, nano technology, applied in the field of nano chelating agent and its preparation, can solve the problem of high cost of metal ions, and achieve the effect of easy reaction conditions, product preparation, and reaction conditions
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[0031] On the other hand, the present invention provides a kind of preparation method of above-mentioned nano-chelating agent, this method comprises: Optionally, the diazonium salt solution of p-aminobenzoic acid can be prepared by the following method: under 0 ℃ condition, the mass concentration Dissolve 0.035g / mL p-aminobenzoic acid in hydrochloric acid with a concentration of 6mol / L to make a mixed solution, and then drop sodium nitrite solution with a concentration of 0.5g / mL into the mixed solution to make p-aminobenzoic acid Formic acid diazonium salt solution, the volume ratio of sodium nitrite solution and mixed solution is 1:8.
[0032] Optionally, the temperature of the azo reaction is 0° C., the time of the azo reaction is 8 min, and the pH value of the azo reaction is 9.
[0033] Alternatively, 2-(4-carboxyphenylazo)-7-(2-arsinoylphenylazo)-1,8-dihydroxy-3,6-naphthalene disulfonic acid solution can be prepared by mass concentration of 0.031 The diazonium salt solu...
Embodiment 1
[0044] Under the condition of ice bath at 0°C, dissolve p-aminobenzoic acid with a mass concentration of 0.035 g / mL in hydrochloric acid with a concentration of 6 mol / L to make a mixed solution, and then drop the sodium nitrite solution with a concentration of 0.5 g / mL into the mixed solution to make a diazonium salt solution of p-aminobenzoic acid, wherein the volume ratio of the sodium nitrite solution to the mixed solution is 1:8.
[0045] Another 1.2 g of sodium phthalic acid azo-1,8-dihydroxynaphthalene-3,6-disulfonate was dissolved in 10 mL of water to prepare phthalic acid azo-1,8-dihydroxynaphthalene-3, 6-Sodium disulfonate solution, add 1.5g lithium hydroxide pH adjuster, place in an ice bath at 0°C, drop the diazonium salt solution of p-aminobenzoic acid into azo-1-phthalic acid in 8 minutes , 8-dihydroxynaphthalene-3,6-sodium sulfonate solution, wherein, the diazonium salt solution of p-aminobenzoic acid and o-phthalic acid azo-1,8-dihydroxynaphthalene-3,6-di The v...
Embodiment 2
[0049] Under the condition of ice bath at 0°C, dissolve p-aminobenzoic acid with a mass concentration of 0.035 g / mL in hydrochloric acid with a concentration of 6 mol / L to make a mixed solution, and then drop the sodium nitrite solution with a concentration of 0.5 g / mL into the mixed solution to make a diazonium salt solution of p-aminobenzoic acid, wherein the volume ratio of the sodium nitrite solution to the mixed solution is 1:8.
[0050] Another 1.2 g of sodium phthalic acid azo-1,8-dihydroxynaphthalene-3,6-disulfonate was dissolved in 10 mL of water to prepare phthalic acid azo-1,8-dihydroxynaphthalene-3, 6-sodium disulfonate solution, add 3g of lithium hydroxide pH regulator, place in an ice bath at 2°C, drop the diazonium salt solution of p-aminobenzoic acid into azo-1-phthalic acid in 10 minutes, 8-dihydroxynaphthalene-3,6-disulfonate sodium solution, in which, the diazonium salt solution of p-aminobenzoic acid and o-phthalic acid azo-1,8-dihydroxynaphthalene-3,6-disu...
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